Hi George
Apologies for the delay in responding - I haven't posted on ET for a while so I had to re-register.
In answer to your question, all of Jack Phillip's Australian relatives are descended from his uncle Fred Phillips who emigrated in the 1870's and became a very successful store owner. I'm afraid Jack wasn't anybody's 'uncle' - neither of his sisters married or had children, so any direct link to him ended with Elsie's death in 1953. I'm not aware of any family members with the surname Clements within the family tree, but it is possible that they could be maternal relatives, descended from the Saunders side of the family. Let me know if you come up with any other names, dates or places once you have spoken to your Father and I will do some more checking for you but, at the moment, I'm afraid that the connection appears to be family folklore.
All the best
Mandy